Pump-piston



PATENTED SEPT. 20, 1904.

P. J. WALLER. PUMP PISTON.

- APPLICATION FILED DEC. 21, 1903.

N0 MODEL Inventor.

by Attorneys.

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UNiTEp STATES Patented. September 20, 1904:.

PATENT @FFTQE.

PUMP-PISTON.

SPECIFICATION forming part of Letters Patent N 0. 770,513, datedSeptember 20, 1904. Application filed December 21, 1903. Serial No.186,113. (No model.)

To all whom, it may concern.-

Be it known that I, PERRY J. WALLER, a citi- Zen of the United States,residing at Los Angeles, in the county of Los Angeles and State ofCalifornia, have invented new and useful Improvements in Pump-Pistons,of which the following is a specification.

My invention relates to a piston for a plungerpump; and the objectthereof is to produce a piston in which all danger of the valve stickingand not seating shall be eliminated when the piston is in operation. Iaccomplish this object by the mechanism described herein and illustratedin the accompanying drawings, in which Figure l is a central verticalsection of my piston disconnected from the operating mechsired material.

anism, showing the valve in its elevating position for the passage ofwater therethrough. Fig. 2 is a central vertical section of my piston,showing the valve closed. Fig. 3 is a cross-section on the line 3 3 ofFig. 1 looking in the direction of the arrow.

In the drawings, A is the piston-stem, to the lower end of which issecured the valve-seat B. In the upper end of this stem is a socket Cfor the reception of the plunger-rod, (not shown,) by means of which thepiston is 0porated. Near the socket the piston-stem is provided with ashoulder A, to the bottom of which are secured lugs A, which arepreferably cast integral with the shoulder and stem. These lugs serve asa stop to limit the upward movement of the valve D, which is loosely andslidably mounted upon the piston-stem intermediate the valve-seat andthe shoulder. Other means may be used to limit the movement of thevalve. In the valve and surrounding the piston-stem are a plurality ofchannels E, which provide waterways for the passage of the water upthrough the valve and between the valve and stem into the space abovethe valve and below the shoulder, from which space the water passes outabove the valve between the lugs on the shoulder. To the lower face ofthe valve I preferably secure a gasket F, of sole-leather; but the samemay be of any de- If desired, the gasket may be omitted by facing thevalve.

valve rests upon the valve-seat, this gasket covers the openings Gr inthe valve-seat, so that no liquid may flow back through the valve-seat.In the operation of my piston it is reciprocated in the pump-barrel (notshown) in the usual manner, the valve-seat closely fitting the sides ofthe barrel. As the piston is pushed downward in the pump-barrel theliquid therein forces the valve to the elevated position. (Shown in Fig.1.) A part of the liquid flows around the outside of the valve and apart flows through the channels E and thence out between the lugs A intothe barrel above the valve. The flow of liquid through the channels Eprevents any sand or other obstructions from lodging between the valveand the piston-stem, thereby always insuring the proper seating of thevalve on the upward movement of the piston in the pumpbarrel.

It will be seen that the upper end of the portion of the valveimmediately surrounding the piston-stem-does not come in contact withthe flange A, the valve being stopped in its upward movement by thedepending lug A, which engages the upper face of the valveintermediateits edges, which prevents any batter of the partssurrounding the piston-stem, thus keeping the channels E free andunobstructed.

Having described invention, what I claim as new, and desire to secure byLetters Patent, is-

1. A piston for plunger-pumps comprising a stem having a shoulderprovided with do wnwardly-projecting lugs at the upper portion thereof,said lugs having the lower portion thereof spaced apart and lying at adistance from the stem and being of a length suificient to prevent thevalve from contacting with the shoulder on the stem; a valve-seat havingapertures therethrough secured to the lower portion of said stem; avalve slidably mounted on said stem intermediate the valve-seat andshoulders, and having a plurality of channels therein adjacent to thevalve-stem.

2. A piston for plunger-pumps comprising a stem having avalve-seatsecured to the bot- When the tom thereof; said seat having aperturesextending therethrough; a valve slidaloly mounted on said stem abovesaid seat; channels in said valve adjacent to said stem; means securedto said stem to limit the upward movement of the valve to permit theflow of liquid through said channels on and throughout the downwardmovement of the valve.

In witness that I claim the foregoing I have hereunto subscribed my namethis lath day of December, 1903; T

PERRY J. WALLER.

Witnesses:

G. E. HARPHAM, MARGARET (J. NIOKELESON.

